Wow, so informative! Thank you for sharing that link. I love learning about jewels and this forum is such a great learning tool!Pictures would be awesome.
I don't think you'll have to worry about windowing, yvonne's stones are generally well cut (and she will be able to tell you what to look out for). But here is a description for future gem purchases!
https://www.pricescope.com/community/threads/new-to-coloured-gemstone-buying-read-this-first.174284/